FEAT #11454 TIME 1 add var lang + simplier add root folder + css pinned folder

...rontend/app/folder/folder-menu/folder-menu.component.html

src/frontend/app/folder/folder-menu/folder-menu.component.ts

...end/app/folder/folder-pinned/folder-pinned.component.html

src/frontend/app/folder/folder-tree.component.html

src/frontend/app/folder/folder-tree.component.scss

src/frontend/app/folder/folder-tree.component.ts

src/frontend/app/folder/folders.service.ts

src/frontend/app/folder/panel/panel-folder.component.html

src/frontend/lang/lang-en.ts

src/frontend/lang/lang-fr.ts

src/frontend/lang/lang-nl.ts

src/frontend/plugins/autocomplete/autocomplete.component.ts